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java.lang.Object org.apache.hadoop.mapred.FileInputFormat
public abstract class FileInputFormat
A base class for InputFormat
.
Field Summary | |
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static org.apache.commons.logging.Log |
LOG
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Constructor Summary | |
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FileInputFormat()
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Method Summary | |
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abstract RecordReader |
getRecordReader(InputSplit split,
JobConf job,
Reporter reporter)
Construct a RecordReader for a FileSplit . |
InputSplit[] |
getSplits(JobConf job,
int numSplits)
Splits files returned by listPaths(JobConf) when
they're too big. |
protected boolean |
isSplitable(FileSystem fs,
Path filename)
Is the given filename splitable? Usually, true, but if the file is stream compressed, it will not be. |
protected Path[] |
listPaths(JobConf job)
List input directories. |
protected void |
setMinSplitSize(long minSplitSize)
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void |
validateInput(JobConf job)
Are the input directories valid? This method is used to test the input directories when a job is submitted so that the framework can fail early with a useful error message when the input directory does not exist. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final org.apache.commons.logging.Log LOG
Constructor Detail |
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public FileInputFormat()
Method Detail |
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protected void setMinSplitSize(long minSplitSize)
protected boolean isSplitable(FileSystem fs, Path filename)
fs
- the file system that the file is onfilename
- the file name to check
public abstract RecordReader getRecordReader(InputSplit split, JobConf job, Reporter reporter) throws IOException
InputFormat
RecordReader
for a FileSplit
.
getRecordReader
in interface InputFormat
split
- the InputSplit
job
- the job that this split belongs to
RecordReader
IOException
protected Path[] listPaths(JobConf job) throws IOException
job
- the job to list input paths for
IOException
- if zero items.public void validateInput(JobConf job) throws IOException
InputFormat
validateInput
in interface InputFormat
job
- the job to check
InvalidInputException
- if the job does not have valid input
IOException
public InputSplit[] getSplits(JobConf job, int numSplits) throws IOException
listPaths(JobConf)
when
they're too big.
getSplits
in interface InputFormat
job
- the job whose input files are to be splitnumSplits
- the desired number of splits
IOException
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